Manufacture of salt.



J. H. WEBSTER.

MANUFAGTURE 0F SALT.

APPLICATION FILED SEPT. 191 1912.

1,1 04,854, Patented July 28, 1914 www@ m THE [\ORRIS PETERS CO, F'HO'I`0-LI'I`HO WASHINGTON. D L

maiTED sTAilisEENToE-#Fion y JOHN HERBERT WEBSTER, `or cAERcKrEEeU-s, IRELAND.

jMANUEAcTUEE or SALT. ,y

To aZZ whom t may concern i Be it known that I, JOHN HERBERT WEB- s'rER, a subject of the King of England, residing at Carrickfergus, county` Antrim, Ireland, United Kingdom of Great Britain and Ireland, have invented new and useful Improvenients in and Connected wit-h the Manufacture of Salt, of which thefollowing a specification.

This invention has reference to the manufacture of common salt-chlorid of sodium` by the fusion process, that is, by melting` roch salt, or other kinds of common salt,-b'y heat; and has primarily for its object and edect to provide improvements by which salt of a high quality` as regards 'colorwhiteness-and purity, can be continuously-in contradistinction to* intermittently--produced According to this invention, discolo-red rock salt, or salt madeby artificial or natural evaporation, or otherwise, is melted by heat in a furnace or chamber, and as it is melted it flows intona secondary'chamb-er or furnace wherein it is continuously agitated and operated upon by air,` by forcing "it through it, or `by' mechanical agitating means, or both; and from this chamberwherein it is maintained in a full fluid 'state by heat--it is arranged to flow continuously into another chamber or vessel-also heated, and flow through it quietly, and tok continuously and quietly discharge or flow from it.

In this passage through the latter chamber,L

or vessel, in a quiet manner, the foreign solid and discoloring `matters contained in' In some cases, the molten salt flowingfrom the melting furnace, may be first runy into a chamber or-bath wherein the heavier impurities or foreign solid matters, or some of them, will deposit, land be separated; and

then run into a second chamber or vessel,`

wherein it is agitated or treated as described; and then iiow into and through another chaiiiber or vessel wherein it is finally clarified by the settling out of the solid or giscoloriiig matters contained in it, as speci- A furnace or plant having these characn Specification of Letters Patent. y f PatentedJuly 28, 1914, *f Application filed September `19, 1912T Seria1No.721,290. i

teristics is illustrated in-theannexed drawings, which show it in longitudinal section in Figure l, and in plan in Fig. 2. y

Iii these ydrawings, @represents the furnace chamber in which the salt is introduced .and melted. From this melting furnace or chamber, the molten salt passes by a portk or ports c into a chamber or bath CZ, wherein^ the heavier impurities or foreign solid matter, or some of them, will deposit, and be separated-1 It then runs'from' this into ak second chamber or vessel f over a dam or wall e, orrather through gutters or channels j provided init for this purpose of passing from one bath to the other. u In his bath or chamber fit-fthe molten salt#is agitated or treated as yabove describede-say by air under pressurepassed through it from pipes g, the lower partsjef which are within the liquid, andfrom which the air is discharged through holes in them and this air-or whatever agitation is adopted-is preferably continuously applied; `but it may in some cases be intermittently applied; From this bath or chamber f it iowsr into another chamber through gutters or channels Z inthe di- `vision wall i, wherein it is finally clariedr bythe settling out yof thefremaining solid or discoloring matters contained in it (which the agitating or blowing action renders pos-V sible or assists) as specified; and inpassing through this bath yor chamber tfrom: the inlet vgutters orichannels Z to the outlet or outlets Zo, which is or are placed preferably as far as possble from the point of inlet, ork a long way from it; its iiowwill be quiet,

and so it is in a condition in Vwhich the foreign or other matters referred to, contained' `in it, candeposit, and so separate `from the` 'puriiied'and white salt;v and in this state it will flow from the outlet lconduit or 'conduitsthe level or'levelsy of which will-'be Inearthe 4upper level of liquid salt-ina continuous and ouiet discharge. f y

From the chamberor bath d, or in fact any of the baths or chambers through which the molten salt passes, in undergoing the purifying and whitening actions or proc-' esses, the deposited and separated matters may be removed simply by fishing?7 ythem outwith suitable ladles or instruments; or,

if desired, they may be run out ,throughV `suitable tap-pingholes or channelsp In the apparatus shown, the chambers or b aths inv which this treatment and puriiication are carried on, are comparatively shallow, andV the molten salt overflows from one to the other, through the channels or gutters in the dams or division walls; andthese channels or gutters are preferably disposed at points which are not opposite each other, as shown by the plan in F ig. 2; so that the flow through them is not direct, but more or less circuitous or oblique. In other words, the inlet or outlet channels or gutters are staggered in relation to each other, so that the liquid all over the bath will be in a state of flow, and be constantly as a body moving forward slowly through the successive baths, and so that as full opportunity as is possible for the foreign and discoloring matters contained in the salt to deposit and separate I out, is afforded.

ln the case sho-wn, the upper portion of the chambers or spaces of the furnace or plant, in which the operations take place, is common to all of them; that is, they are all in free and open communication with each other; and the heating medium necessary to maintain the liquid at the required temperature, may be introduced at any suitable point or points, either through separate gas or oil and air ports, or from the furnace a, or in any suitable way.; and the products of combustionwill be carried ofl:l by the outlet conduits Z.

lWhat is claimed is :n v l. Process for the manufacture of pure white salt-chlorid of sodium-consisting in agitating salt while it is in a molten state and in a state of flow; subsequentlycausing it to pass slowly and quietly through a bath or chamber; and then discharging it continuously. 2. Process for the manufacture of pure white saltchlorid of` sodium-consisting in mechanically agitating flowing molten salt; and subsequently passing the flowing molten salt slowly and` quietly through a bath or chamber and continuously,discharging the owing molten purified white salt.

3. Continuous process for the manufac` turefof pure white salt-chlorid of sodiumconsisting in agitating flowing molten salt;

passing the flowing molten salt, after it has been agitated, through a bath or chamber; and then continuously discharging the molten puried white salt.

4. Continuous process for the manufacture of pure white salt-chlorid of sodium-consisting in agitating flowing molten salt by lblowing or forcing air through it; passing the flowing molten salt, after it has been agitated, through a bath or chamber; and then continuously discharging the molten puried white salt.

5.Process for the manufacture of pure white saltchloriol of sodiumconsisting in agitating flowing molten salt by blowing or forcing air through it and mechanically agitating the flowing body of molten salt; slowly and quietly passing the flowing molten salt, after it hasbeen agitated, through a bath or chamber; and then continuously discharging the molten purified white salt.

6. Process for rendering common salt pureand white consisting in passing a body of molten salt through a trough for settling of coarse impurities, agitating the flowing body `of molten salt after settling out the coarse impurities by blowing air through the flowing body, and passing the flowing body of molten salt through a second trough forv settling out the remaining impurities after agitating the flowing body of molten salt.

7. Process for rendering common salt pure and white consisting in passing a body of molten salt through a trough for settling of coarse impurities, agitating the flowing v body of molten salt after settling out the coarse impurities by mechanical means and by ,blowing air through the flowing body and passing the flowing body of molten salt througha second trough for settlingfout the remaining impurities after agitating the flowing body of molten salt.

yIn testimony whereof I have signed my l name to this specification in the presence of two subscribingwitnesses.

JOHN HERBERT WEBSTER.

lVitnesses:

ALFRED W. BROWN, H. G. BARonor'r, Jr.

Copies of this patent may be obtained for ve cents each, byaddressing the Commissioner of Patents,

' Washington, D..C. 

